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bq24171 充电管理IC问题请教

Other Parts Discussed in Thread: BQ24171

我们用bq24171方案开发了一个输入12.6V,输出8.4V两通道的充电板,现在调试时发现一个通道充电正常,另外一个通道VBAT2开机正常有8.4V输出,转入快充时,电压被拉低,无法充电。请问是什么原因?